Diversity is a good thing with content, a lot of the problem with getting that is the inherent risk to the creator will skyrocket when doing something different. It's pretty much a gamble with something new whereas making more of what has a proven sales performance is like backing the low odds horse. Also creating something different can take a lot more time than creating a variant of something you have done before

Which means as a creator I could make a swimsuit for V4, Swimsuits sell well and V4 is well supported and high takeup can be anticipated if the item is of high enough quality. If I spend a week crafting the item I should see a return that is worthwhile for my time.

If I decide to create something much more niche for a lesser known figure the risk goes up of the product being a flop quite dramatically.

I agree with Boni providing better incentives would be a much more effective way of encouraging content creators to diversify. It can't be forced it's like saying to a romance novelist, you know what we already have taken 4 romance novels this month go and write as a sci-fi horror. The writer is more likely to either find a new publisher or not write anything when being strong handed in this way.

So while they shouldn't be "Forced" there is no reason they couldn't be encouraged. But that would depend on the market place being proactive.